When right clicing on a horse with something that cannot be used on it, the horse reacts accordingly, but a hand animation still plays when doing so. In line with MC-162036, this should be considerd an unsuccessful interaction and no hand animation should play.
Linked issues
discovered while testing 1
is cloned by 1
is duplicated by 1
relates to 3
MC-171664
Right-clicking on villagers that has a profession sometimes can cause hand animation to still play after destroying a villager's workstation
Resolved
MC-162036
Trying to right-click unemployed/nitwit villagers does not display arm animation
Resolved
MC-184400
Llama does not produce any sounds if right-clicked with other spawn eggs or unrenamed name tags
Resolved
muzikbike
Right clicking upsets them if you don't use an item they want, so it is intentional that the arm swings, since the action is still taking place